Hmm, strange that mine makes those noises and yet still somehow works. My temperatures are around 46/47 degrees, going by this thread they seem to be normal. I will try and replace it with my desktop fan and see if it changes, once I get back from work.
Actually to clarify what I meant, the clicking was probably because the fan wasn't moving at all, my temps were rising so it was constantly trying to alter the fan speed to bring the temps down.
Once the fan was unplugged the clicking stopped, and my desk fan was enough to keep it cool.
Yours may not be as bad as it's working a bit and your temps are ok.